Which one of the following substances adsorbs hydrogen gas most strongly?

Physical adsorption is essentially quite appreciable:

Select the graph that correctly describes the adsorption isotherms at two temperatures $T_{1}$ and $T_{2}$ $\left(T_{1}>T_{2}\right)$ for a gas :
($x-$ mass of the gas adsorbed ; $m-$ mass of adsorbent ; $P -$ pressure)

Why does the white precipitate of silver halide become coloured in the presence of dye eosin?

Which plot is the adsorption isobar for chemisorption?

When a dilute aqueous solution of $AgNO_3$ (excess) is added to $KI$ solution,positively charged sol particles of $AgI$ are formed due to the adsorption of which ion?